/* base.css — layout + components. Color comes from tokens/themes. */

* { box-sizing: border-box; }
/* The `hidden` attribute must win over class-level display:flex/grid rules. */
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

h1, h2, h3 { line-height: 1.25; margin: 0 0 var(--sp-3); }
p { margin: 0 0 var(--sp-3); }

/* ---------- Buttons ---------- */
.btn {
  font: inherit;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  padding: var(--sp-2) var(--sp-4);
  border-radius: var(--r-2);
  cursor: pointer;
  transition: background var(--motion-fast) ease, transform var(--motion-fast) ease, border-color var(--motion-fast) ease;
  min-height: 40px;
}
.btn:hover { border-color: var(--accent); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; font-weight: 650; }
.btn-ghost { background: transparent; }
.btn-run { min-width: 92px; font-size: var(--fs-lg); }
/* Bigger touch targets on touch devices (>=44px per Apple HIG). */
@media (pointer: coarse) { .btn { min-height: 44px; } }

/* ---------- Loader ---------- */
.loader, .boot-error {
  position: fixed; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: var(--sp-3);
  text-align: center; padding: var(--sp-5);
  background: radial-gradient(1200px 600px at 50% 30%, var(--bg-2), var(--bg));
  z-index: 50;
}
.loader-rocket { font-size: 56px; animation: float 2.4s ease-in-out infinite; }
.loader-title { font-size: var(--fs-xl); margin: 0; }
.loader-note { color: var(--muted); margin: 0; }
.loader-bar {
  width: min(320px, 80vw); height: 10px; border-radius: 999px;
  background: var(--panel-2); overflow: hidden; border: 1px solid var(--border);
}
.loader-bar-fill {
  height: 100%; width: 40%;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  animation: slide 1.6s linear infinite;
}
[data-motion="reduced"] .loader-rocket,
[data-motion="reduced"] .loader-bar-fill { animation: none; }
[data-motion="reduced"] .loader-bar-fill { width: 100%; opacity: .6; }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@keyframes slide { from { transform: translateX(-120%); } to { transform: translateX(320%); } }

.boot-error-icon { font-size: 56px; }
.boot-error h2 { font-size: var(--fs-xl); }

/* ---------- App shell ---------- */
.app { min-height: 100%; display: flex; flex-direction: column; }
.topbar {
  min-height: var(--topbar-h); flex: 0 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-2);
  /* min-height (not fixed height) so the bar GROWS instead of clipping wrapped content;
     safe-area padding so controls clear the notch / rounded corners. */
  padding: env(safe-area-inset-top) max(var(--sp-4), env(safe-area-inset-right)) 0 max(var(--sp-4), env(safe-area-inset-left));
  background: var(--panel); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.brand { display: flex; align-items: center; gap: var(--sp-2); font-weight: 700; min-width: 0; }
.brand-mark { font-size: 22px; flex: 0 0 auto; }
.brand-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.topbar-right { display: flex; align-items: center; gap: var(--sp-2); flex-wrap: wrap; justify-content: flex-end; }
.progress-summary { color: var(--muted); font-size: var(--fs-sm); margin-right: var(--sp-2); }

/* On phones, drop the long brand suffix + progress text so the controls fit cleanly. */
@media (max-width: 600px) {
  .brand-suffix { display: none; }
  .progress-summary { display: none; }
}

/* Blue Horizon Labs footer — sits at the bottom of the app's flex column. */
.app-footer {
  flex: 0 0 auto;
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  gap: var(--sp-1) var(--sp-3);
  padding: var(--sp-3) max(var(--sp-4), env(safe-area-inset-right)) max(var(--sp-3), env(safe-area-inset-bottom)) max(var(--sp-4), env(safe-area-inset-left));
  border-top: 1px solid var(--border);
  color: var(--muted); font-size: var(--fs-sm);
  text-align: center;
}
.app-footer a { color: var(--accent); text-decoration: none; }
.app-footer a:hover { text-decoration: underline; }
.app-footer-copy { font-size: var(--fs-xs, 0.75rem); }

.layout {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: minmax(320px, 460px) 1fr;
  gap: var(--sp-4);
  padding: var(--sp-4) max(var(--sp-4), env(safe-area-inset-right)) var(--sp-4) max(var(--sp-4), env(safe-area-inset-left));
  max-width: var(--maxw); width: 100%; margin: 0 auto;
  align-items: start;
}
@media (max-width: 880px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--r-3);
  padding: var(--sp-5);
  box-shadow: var(--shadow);
}

/* ---------- Lesson panel ---------- */
.lesson-kicker { color: var(--accent); font-weight: 650; font-size: var(--fs-sm); letter-spacing: .04em; text-transform: uppercase; }
.lesson-title { font-size: var(--fs-xl); margin-top: var(--sp-1); }
.lesson-section { margin-top: var(--sp-4); }
.lesson-section h3 { font-size: var(--fs-sm); text-transform: uppercase; letter-spacing: .04em; color: var(--muted); margin-bottom: var(--sp-2); }
.bridge {
  background: var(--panel-2); border: 1px dashed var(--border);
  border-radius: var(--r-2); padding: var(--sp-3); color: var(--text);
}
.bridge .bridge-from { color: var(--muted); }
.example-code, .annotation-list { font-family: var(--font-code); font-size: var(--fs-code); }
.annotation-list { list-style: none; padding: 0; margin: var(--sp-2) 0 0; }
.annotation-list li { margin-bottom: var(--sp-2); color: var(--muted); font-family: var(--font-body); font-size: var(--fs-sm); }
.annotation-list code { color: var(--star); }
.goal-box {
  background: var(--success-bg); border: 1px solid var(--success);
  border-radius: var(--r-2); padding: var(--sp-3); color: var(--text);
}
.tryit { color: var(--text); }

/* Hints */
.hint-btn { margin-top: var(--sp-3); }
.hint-list { margin-top: var(--sp-3); display: flex; flex-direction: column; gap: var(--sp-2); }
.hint-item {
  background: var(--panel-2); border: 1px solid var(--border);
  border-radius: var(--r-2); padding: var(--sp-3); font-size: var(--fs-sm);
}
.hint-item pre { white-space: pre-wrap; font-family: var(--font-code); margin: var(--sp-2) 0 0; }

/* Challenge */
.challenge-box {
  margin-top: var(--sp-4); padding: var(--sp-3);
  border: 1px solid var(--accent); border-radius: var(--r-2);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

/* ---------- Workspace ---------- */
.workspace { display: flex; flex-direction: column; gap: var(--sp-4); }
.workspace-head { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3); }
.workspace-title { font-size: var(--fs-lg); margin: 0; }
.workspace-actions { display: flex; gap: var(--sp-2); }

.editor-host {
  border: 1px solid var(--border); border-radius: var(--r-2);
  overflow: hidden; background: var(--code-bg);
}
.cm-editor { font-size: var(--fs-code); }
.cm-editor.cm-focused { outline: 2px solid var(--accent); }
/* Touch: keep editor text >=16px so iOS/iPadOS Safari doesn't auto-zoom on focus. */
@media (pointer: coarse) {
  .cm-editor, .cm-editor .cm-content { font-size: max(16px, var(--fs-code)); }
}
/* Stacked (small) layouts: cap editor height so Run + Output stay reachable. */
@media (max-width: 880px) {
  .editor-host .cm-scroller { max-height: 45svh; }
}

.example-editor { margin-top: var(--sp-2); border: 1px solid var(--border); border-radius: var(--r-2); overflow: hidden; opacity: .95; }

.output-area { display: grid; grid-template-columns: 1fr; gap: var(--sp-3); }
.output-area:has(.canvas-block:not([hidden])) { grid-template-columns: 1fr 1fr; }
@media (max-width: 700px) { .output-area:has(.canvas-block:not([hidden])) { grid-template-columns: 1fr; } }
.output-label { font-size: var(--fs-sm); color: var(--muted); margin-bottom: var(--sp-1); }
.output-console {
  margin: 0; min-height: 96px; max-height: 240px; overflow: auto;
  background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--r-2);
  padding: var(--sp-3); font-family: var(--font-code); font-size: var(--fs-code);
  white-space: pre-wrap; word-break: break-word;
}
.output-console .err { color: var(--warn); }
.canvas-wrap { background: #05060f; border: 1px solid var(--border); border-radius: var(--r-2); padding: var(--sp-2); }
#turtle-canvas { width: 100%; height: auto; display: block; border-radius: var(--r-1); }

/* ---------- Result / error cards ---------- */
.result-area:empty { display: none; }
.card {
  border-radius: var(--r-2); padding: var(--sp-4); border: 1px solid var(--border);
  animation: rise var(--motion-med) ease;
}
@keyframes rise { from { transform: translateY(6px); opacity: 0; } to { transform: none; opacity: 1; } }
.card-success { background: var(--success-bg); border-color: var(--success); }
.card-tryagain { background: var(--warn-bg); border-color: var(--warn); }
.card-error { background: var(--warn-bg); border-color: var(--warn); }
.card h3 { margin: 0 0 var(--sp-2); }
.card .card-fix { font-family: var(--font-code); font-size: var(--fs-code); background: var(--code-bg); padding: var(--sp-2) var(--sp-3); border-radius: var(--r-1); display: inline-block; margin-top: var(--sp-2); }
.card .robot-details { margin-top: var(--sp-3); color: var(--muted); }
.card .robot-details pre { white-space: pre-wrap; font-size: var(--fs-sm); overflow: auto; max-height: 160px; }
.card-actions { margin-top: var(--sp-3); display: flex; gap: var(--sp-2); flex-wrap: wrap; }

/* ---------- Lesson nav ---------- */
.lesson-nav { display: flex; gap: var(--sp-2); margin-top: var(--sp-5); flex-wrap: wrap; }
.lesson-nav .spacer { flex: 1; }

/* ---------- Drawer / overlay ---------- */
.drawer {
  position: fixed; top: 0; right: 0; height: 100%; width: min(360px, 90vw);
  background: var(--panel); border-left: 1px solid var(--border);
  box-shadow: var(--shadow); z-index: 40;
  padding: max(var(--sp-5), env(safe-area-inset-top)) max(var(--sp-5), env(safe-area-inset-right)) max(var(--sp-5), env(safe-area-inset-bottom)) var(--sp-5);
  overflow-y: auto;
  transform: translateX(0);
}
.drawer[hidden] { display: none; }
.drawer-scrim { position: fixed; inset: 0; background: rgba(0,0,0,.45); z-index: 39; }
.drawer-scrim[hidden] { display: none; }
.setting-row { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-3); padding: var(--sp-3) 0; border-bottom: 1px solid var(--border); }
.setting-row label { font-weight: 600; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: var(--r-2); overflow: hidden; }
.seg button { border: none; background: transparent; color: var(--text); padding: var(--sp-2) var(--sp-3); cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
.switch { width: 52px; height: 30px; border-radius: 999px; border: 1px solid var(--border); background: var(--panel-2); position: relative; cursor: pointer; }
.switch[aria-checked="true"] { background: var(--accent); }
.switch::after { content: ""; position: absolute; top: 3px; left: 3px; width: 22px; height: 22px; border-radius: 50%; background: var(--text); transition: left var(--motion-fast) ease; }
.switch[aria-checked="true"]::after { left: 25px; background: var(--accent-ink); }

.overlay { position: fixed; inset: 0; background: rgba(0,0,0,.55); display: flex; align-items: center; justify-content: center; z-index: 45; padding: var(--sp-4); }
.overlay[hidden] { display: none; }
.overlay-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-3); padding: var(--sp-5); max-width: 720px; width: 100%; max-height: 86vh; max-height: 86svh; overflow: auto; }
.overlay-head { display: flex; align-items: center; justify-content: space-between; }
.map-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: var(--sp-3); margin-top: var(--sp-4); }
.map-cell { text-align: left; padding: var(--sp-3); border-radius: var(--r-2); border: 1px solid var(--border); background: var(--panel-2); cursor: pointer; }
.map-cell .num { color: var(--muted); font-size: var(--fs-sm); }
.map-cell .ttl { font-weight: 600; display: block; margin-top: var(--sp-1); }
.map-cell.done { border-color: var(--success); }
.map-cell.current { outline: 2px solid var(--accent); }
.map-cell .chk { color: var(--success); }
.map-world-header { grid-column: 1 / -1; margin-top: var(--sp-3); font-weight: 700; color: var(--text); border-bottom: 1px solid var(--border); padding-bottom: var(--sp-1); }
.map-world-header:first-child { margin-top: 0; }

/* ---------- Celebration ---------- */
.celebrate-host { position: fixed; inset: 0; pointer-events: none; z-index: 48; display: flex; align-items: flex-start; justify-content: center; }
.celebrate-banner {
  margin-top: 12vh; margin-top: 12svh; pointer-events: auto;
  background: var(--panel); border: 1px solid var(--success);
  border-radius: var(--r-3); padding: var(--sp-5); text-align: center; box-shadow: var(--shadow);
  animation: pop var(--motion-med) ease;
}
@keyframes pop { from { transform: scale(.9); opacity: 0; } to { transform: none; opacity: 1; } }
.badge-chip { display: inline-flex; align-items: center; gap: var(--sp-2); background: var(--panel-2); border: 1px solid var(--border); border-radius: 999px; padding: var(--sp-1) var(--sp-3); margin-top: var(--sp-2); }

.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }